IRS Taxpayer Advocate Service IRSTAS IRS Taxpayer Advocate Service IRS Taxpayer Advocate Service Servicio de Defensor del Contribuyente del IRS Servicio de Defensor del Contribuyente del IRS Service de Défense des Contribuables de l'IRS שירות המגן על המשלם של מס הכנסה של IRS आयकर दाता प्रतिनिधि सेवा IRS納税者アドボケートサービス Serviço de Defensoria do Contribuinte do IRS 美国国税局纳税人维权服务 IRSTAS IRS Taxpayer Advocate Service The Taxpayer Advocate Service (TAS) is an independent organization within the Internal Revenue Service (IRS). Its job is to ensure that every taxpayer is treated fairly and that taxpayers know and understand their rights.